bad WOT on 2 into 1 carb

[cOoLDeviL]

hi all i have a problem in my banshee at WOT it cut off so fast in 6th gear like it stop from rev. more than that and in this case when i back the throtle bach to 3\4 or less it start to move faster than full throtle and i see the speed meter start to move forward and feel the banshee pulling up " trail tech computer " and my setup is :

 

45 pilot 4th clip needle from top 225 main jet with direct mount k&n and im at sea level and now it idle fine but only start cold with choke and when its hot it start ok .

 

stock engine with yamaha pistons 64.25 no porting.

 

1- FMF SST pipe.

2- milled head with 145 psi .

3- trinity 35mm single carb .

4- ported reed cages with power reeds .

5- timing plate with +3 .

6- stock gearing 14\41 .

7- GYT-R CDI .

 

 

soon lighted flywheel in the way

Edited November 5, 2004 by cOoLDeviL

[DUNEDEMON]

Sounds way too rich @ WOT, try swapping that 225 main for a 180.

[sredish]

Get an EEK needle from carbparts.com. I was having problems with mine. I was using the richest main I could find, no air leaks, I mean NONE.

 

Went to an EEK and back down to a 205 main and it runs like a scalded fucking mutt!!

[Leadfoot350]

Do one thing at a time. Try a 200 main. Put the clip on the needle on the very bottom and see how that does before buying a new needle. I am guessing it cam with a dek but sometimes they give you the wrong one. How many turns out is your air screw? It should be 1.5 to 2 turns out. If not you should get a new pilot. Dont go down too big on the main like to a 180 because you will blow that piston up.

Edited November 5, 2004 by Leadfoot350

[sredish]

The thing is, he said WOT, and that rules out the air screw. That rules out the clip position, and leaves it all back to the main. The only way a needle will affect WOT is with the taper, that's why I suggested the EEK with a slightly steeper taper. If it's bogging and then picking back up at 3/4 throttle, then it sounds like the main is a little lean.

 

You can try the 200 like he said and see if it works better, but if it doesn't, quit screwing around and do what I suggested. I just got done with 5 months of jetting, checking for air leaks, changing gaskets and orings and ended up with the EEK needle and finally got my power that I needed. Some machines often have problems with this.

 

Later and good luck.

[Banchetta]

Sounds like your not getting enough fuel on the mains...but that sounds like a pretty good size main...I don't have a lot of knowledge w/ the 2 into 1 setup. If you can't get enough fuel by the needles then do like sredish suggested and go from there...you can only get so much fuel through the gooseneck which the needle sits into. No matter how big the main is, if the needle won't allow anymore fuel than a 200 main through that gooseneck, then a larger main will do nothing. You could also try raising the needle another notch.

[FIRST BANSHEE]

The thing is, he said WOT, and that rules out the air screw. That rules out the clip position, and leaves it all back to the main. The only way a needle will affect WOT is with the taper, that's why I suggested the EEK with a slightly steeper taper. If it's bogging and then picking back up at 3/4 throttle, then it sounds like the main is a little lean.

 

You can try the 200 like he said and see if it works better, but if it doesn't, quit screwing around and do what I suggested. I just got done with 5 months of jetting, checking for air leaks, changing gaskets and orings and ended up with the EEK needle and finally got my power that I needed. Some machines often have problems with this.

 

Later and good luck.

I'd listen to sredish,he's done the homework for you.

Tuned properly you should have no flat spots with the 2-1 setup.

[sredish]

Some machines often have problems with this.

What I meant was, some machines have this problem when mated with the 2-1. I think it has to do with vacuum/air velocity into the motor not drawing enough fuel personally, but in this situation, the richer tapered needle will remedy this prob and you won't be able to keep the front end down my brotha!!

[Leadfoot350]

He does not have porting so 225 is a big main jet. I was useing a dek needle and had to drop the clip all the way down and it ran almost perfect so I now have the eek needle as well but have not tried it. If shredish is right about the needle then you should leave your main alone and drop the clip on the needle all the way down and see how that works.

[sredish]

I was at a 230 main with my DEK needle. Now I'm at 205 with my EEK and much better power, keeps on hitting as the rpms climb and doesn't lean out in 5th and 6th.

[cOoLDeviL]

ok sredish you say that i should drop the main jet to 200 but i only have 195 is it ok. and for the needle do i have to drop it to the last clip down with 195 main . but when i ride it it has a good response all the way up .

[Leadfoot350]

shredish, where did you have the clip on the dek with the 230 main?

[FIRST BANSHEE]

ok sredish you say that i should drop the main jet to 200 but i only have 195 is it ok. and for the needle do i have to drop it to the last clip down with 195 main . but when i ride it it has a good response all the way up .

Read before asking ?, sredish is running a 205 main and a eek needle. If you buy his plane ticket maybe he'll tune it for you.

[sredish]

shredish, where did you have the clip on the dek with the 230 main?

i also meant to say, all the above is unported.

 

I was running my dek in the 4th clip with my 230 main. It was too rich in the 5th, but not at WOT, it was too rich at 1/2 to 3/4, didn't transition well to the main.

 

Now, with the EEK in the 4th and 205 main it pulls totally awesome from 1/2 to 3/4 throttle, no hesitation or richness and just keeps pulling harder to WOT. Transition is much much better with this needle.

 

I've since sent my cylinders off for porting, so I'll be starting all over again. Oh well, I'm sure it will be worth it, but we'll see where my jetting ends up. I might not have to richen up a whole lot, because there should be a lot more air velocity, therefore pulling a lot more fuel along with it. I'm hoping so.

 

I'll be sure to post the results on here.

[cOoLDeviL]

ok sredish what kind of port job you want to use ? and which pistons ? and for the EEK needle what is the part number for it ?